shock impedance
Electrical resistance measured across defibrillation leads during high-energy therapy delivery, affecting shock efficacy and safety.
Full Definition
Shock impedance represents the total electrical resistance encountered during defibrillation energy delivery through ICD shock leads, including the lead conductors, electrodes, and body tissues in the shock pathway. This parameter directly affects defibrillation efficacy and device longevity, as abnormal impedance values can indicate lead problems or suboptimal shock vector configuration. Medical editors working with ICD documentation must understand that shock impedance differs from pacing impedance and requires different measurement techniques and normal value ranges.
Usage
Usage note: Distinguish from pacing impedance; include normal value ranges; specify measurement conditions (test shock vs. therapy).
In Context
- "Shock impedance measurements confirmed adequate defibrillation lead integrity following system implantation." — Implant procedure report
- "Abnormal shock impedance values may indicate lead fracture or inadequate tissue contact requiring further evaluation." — Device troubleshooting guide